books.google.com - With its wealth of little-known historical data, this book chronicles the classic pattern of gold and silver rushes and emphasizes the differences between Nevada's two mining boom periods--the Comstock Lode of the 19th century and the latter-day boom period of the 20th century....https://books.google.com/books/about/Nevada_s_Twentieth_century_Mining_Boom_T.html?id=HkeA6xD97QcC&utm_source=gb-gplus-shareNevada's Twentieth-century Mining Boom: Tonopah, Goldfield, Ely